What is mean by octane no for fuel?

Question

What is mean by octane no for fuel?

Answer 1

The octane rating is a measure of the resistance of gasoline and other fuels to autoignition in spark-ignition internal combustion engines. High-performance engines typically have higher compression ratios and are therefore more prone to engine knocking, so they require higher octane fuel. A lower-performance engine will not generally perform better with high-octane fuel, since the compression ratio is fixed by the engine design.

The octane number of a fuel is measured in a test engine, and is defined by comparison with the mixture of iso-octane and normal heptane which would have the same anti-knocking capacity as the fuel under test: the percentage, by volume, of iso-octane in that mixture is the octane number of the fuel. For example, gasoline with the same knocking characteristics as a mixture of 90% iso-octane and 10% heptane would have an octane rating of 90. [1] Because some fuels are more knock-resistant than iso-octane, the definition has been extended to allow for octane numbers higher than 100.

Answer 2

the octane rating for gasoline is an indication of its resistance to detonation. the higher the octane rating, the higher the detonation resistance. however use only the highest octane rating to stop detonation and no more.

Answer 3

Gasoline should burn, not explode in the cylinder. The explosions are called "knock" . If your engine knocks, go to a higher octane.